Bicycle seat-post.



No. 653,4l0. Patented July l0, I900 J. H. CASH.

. BICYCLE SE AT POST.-

(Application filed Aug. 24, 1899.) (No Model.)

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UNITED STATES PATENT 0 FFICE.

JAMES HENRY CASH, OF TORONTO, CANADA, ASSIGNOR TO JAMES BREWER RITTENHOUSE, OF SAME PLACE.

BICYCLE SEAT-POST.

SPECIFICATION forming part of Letters Patent No. 653,410, dated July 10, 1900. Application filed August 24, 1899. Serial No. 728,299. No model.)

T0 00% whom it may concern.-

Be it known that I, JAMES HENRY CASH, a citizen of the United States of America, residing at Tor0nto,in the county of York, Province of Ontario, Canada, have invented certain new and useful Improvements in Bicycle Seat- Posts, of which the following is a specifica tion.

My invention relates to improvements in bicycle seat-posts; and the-object of my in vention is to provide a bicycle seat-post which will permit of the bicycle-saddle being quickly adjusted to the desired height; audit consists, essentially, of a longitudinally-slotted member which is designed to screw into an internally-threaded sleeve and a key for locking the said longitudinally-slotted member to the sleeve, as hereinafter more particularly explained.

Figure 1 is a perspective view of my seatpost, parts being broken away to show the construction thereof. Fig. 2 is an enlarged section through the seat-post on the line my, Fig. 1. Fig. 3 is an enlarged perspective view of the key. Fig. 4 is a side view of part of a bicycle-frame, showing my seat-post held therein.

In the drawings like letters of reference indicate corresponding parts in each figure.

The seat-post A is provided with a longitudinal dovetailed groove B,which extends from the bottom thereof up to any desired height.

. The lower threaded portion C of the seat-post A screws into the internally-threaded sleeve D. In the inner surface of the sleeve D, commencing at its upper end and extending downwardly a little beyond'the length of the key E, is a square slot F, (see Fig. 2,) into which fits the side a of the keyE. On reference to Fig. 4 it will be seen that the sleeve D is placed in the upward reach G and is prevented from falling down too far by its flange H. Immediately the said sleeve is placed in position the nut O is tightened and, pinching the upper portions of the upward reach G together,

firmly holds the sleeve D in place. The seatpost is then screwed into the sleeve D and adjusted to the required position.

The side a of the key E is of the same shape as the dovetailed groove B and fits snugly said groove. When the dovetailed groove B is brought into alinement with the slot F, the key E (which has been inserted from the bottom of the dovetailed groove B and moved up near the top thereof) is moved down, and

its side a, engaging with the slot F locks the seat-post A securely in place. As the key E is tapered from c to d, it will be understood that when it is pushed down into position (see Fig.

1) it forces the parts together and prevents 6o rattling.

The head I of the key E extends beyond the flange H, so that the said key can be easily pulled upwardly when desired.

From this specification it will be seen that my seat-post is of simple construction and quickly and easily adj ustable.

What I claim as my invention is- In an adjustable but non-moving tubular seat-post for bicycles the combination of the tubular post, longitudinal dovetailed groove therein, lower threaded integral portion of said post, the internally-threaded, and rig idly-held sleeve, the key, having the dovetailed portion 6 thereof movably held in the said dovetailed groove and the tapered rectangular side a of said key designed to engage with the locking-slot in said sleeve when the post is adjusted, and thus lock said post in position, substantially as set forth and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES HENRY CASH.

Witnesses:

EGERTON R. CAsn, L. C. REYNOLDS. 

